hysteria2: Add more masquerade options

option/hysteria2.go

@@ -1,5 +1,15 @@
 package option
 
+import (
+	"net/url"
+
+	C "github.com/sagernet/sing-box/constant"
+	E "github.com/sagernet/sing/common/exceptions"
+	"github.com/sagernet/sing/common/json"
+	"github.com/sagernet/sing/common/json/badjson"
+	"github.com/sagernet/sing/common/json/badoption"
+)
+
 type Hysteria2InboundOptions struct {
 	ListenOptions
 	UpMbps                int             `json:"up_mbps,omitempty"`
@@ -8,8 +18,8 @@ type Hysteria2InboundOptions struct {
 	Users                 []Hysteria2User `json:"users,omitempty"`
 	IgnoreClientBandwidth bool            `json:"ignore_client_bandwidth,omitempty"`
 	InboundTLSOptionsContainer
-	Masquerade  string `json:"masquerade,omitempty"`
-	BrutalDebug bool   `json:"brutal_debug,omitempty"`
+	Masquerade  *Hysteria2Masquerade `json:"masquerade,omitempty"`
+	BrutalDebug bool                 `json:"brutal_debug,omitempty"`
 }
 
 type Hysteria2Obfs struct {
@@ -22,6 +32,83 @@ type Hysteria2User struct {
 	Password string `json:"password,omitempty"`
 }
 
+type _Hysteria2Masquerade struct {
+	Type          string                    `json:"type,omitempty"`
+	FileOptions   Hysteria2MasqueradeFile   `json:"-"`
+	ProxyOptions  Hysteria2MasqueradeProxy  `json:"-"`
+	StringOptions Hysteria2MasqueradeString `json:"-"`
+}
+
+type Hysteria2Masquerade _Hysteria2Masquerade
+
+func (m Hysteria2Masquerade) MarshalJSON() ([]byte, error) {
+	var v any
+	switch m.Type {
+	case C.Hysterai2MasqueradeTypeFile:
+		v = m.FileOptions
+	case C.Hysterai2MasqueradeTypeProxy:
+		v = m.ProxyOptions
+	case C.Hysterai2MasqueradeTypeString:
+		v = m.StringOptions
+	default:
+		return nil, E.New("unknown masquerade type: ", m.Type)
+	}
+	return badjson.MarshallObjects((_Hysteria2Masquerade)(m), v)
+}
+
+func (m *Hysteria2Masquerade) UnmarshalJSON(bytes []byte) error {
+	var urlString string
+	err := json.Unmarshal(bytes, &urlString)
+	if err == nil {
+		masqueradeURL, err := url.Parse(urlString)
+		if err != nil {
+			return E.Cause(err, "invalid masquerade URL")
+		}
+		switch masqueradeURL.Scheme {
+		case "file":
+			m.Type = C.Hysterai2MasqueradeTypeFile
+			m.FileOptions.Directory = masqueradeURL.Path
+		case "http", "https":
+			m.Type = C.Hysterai2MasqueradeTypeProxy
+			m.ProxyOptions.URL = urlString
+		default:
+			return E.New("unknown masquerade URL scheme: ", masqueradeURL.Scheme)
+		}
+		return nil
+	}
+	err = json.Unmarshal(bytes, (*_Hysteria2Masquerade)(m))
+	if err != nil {
+		return err
+	}
+	var v any
+	switch m.Type {
+	case C.Hysterai2MasqueradeTypeFile:
+		v = &m.FileOptions
+	case C.Hysterai2MasqueradeTypeProxy:
+		v = &m.ProxyOptions
+	case C.Hysterai2MasqueradeTypeString:
+		v = &m.StringOptions
+	default:
+		return E.New("unknown masquerade type: ", m.Type)
+	}
+	return badjson.UnmarshallExcluded(bytes, (*_Hysteria2Masquerade)(m), v)
+}
+
+type Hysteria2MasqueradeFile struct {
+	Directory string `json:"directory"`
+}
+
+type Hysteria2MasqueradeProxy struct {
+	URL         string `json:"url"`
+	RewriteHost bool   `json:"rewrite_host,omitempty"`
+}
+
+type Hysteria2MasqueradeString struct {
+	StatusCode int                  `json:"status_code,omitempty"`
+	Headers    badoption.HTTPHeader `json:"headers,omitempty"`
+	Content    string               `json:"content"`
+}
+
 type Hysteria2OutboundOptions struct {
 	DialerOptions
 	ServerOptions